船闸大体积混凝土温控技术应用

Application of temperature control technology for mass concrete in ship lock

针对大体积混凝土频繁产生温度裂缝这一普遍现象,结合具体工程对混凝土温控措施、温控标准进行研究和总结,温控标准和要求主要采用有限元仿真分析的方法研究结构内部温度场和温度变化情况并结合工程经验确定,温控措施主要是控制原材温度、设置冷却水管系统、实时监测温度变化情况,得出入模温度、内部最高温度、内外温差、降温速率、冷却水与混凝土之间的温差、通水时间和停水标准等主要指标建议值。结果表明,控制原材料温度、布设冷却水管降温能提高混凝土本身的抗裂性能,较好地控制了结构温度裂缝的开展,提高结构的安全性和耐久性。

Aiming at the common phenomenon that mass concrete frequently produces temperature cracks,we study and summarize the concrete temperature control measures and temperature control standards according to the concrete engineering,study the temperature control standards and requirements by the finite element simulation and analysis,determine them by engineering experience,summarize the temperature control measures including controlling the raw material temperature,setting the cooling water pipe system,and monitoring the temperature change in real time,and obtain the recommended values of main indexes such as mould temperature,internal maximum temperature,internal and external temperature difference,cooling rate,temperature difference between cooling water and concrete,opening time and water stop standard.The results show that controlling the raw material temperature and setting the cooling water pipe system can improve the crack resistance of concrete,well control the development of the structure temperature crack,and improve the safety and durability of the structure.